I have fixed the issue by putting in a blank label into the AddXY function call.

That will get rid of all the grid lines. I don't want that. I want to only get rid of the grid line that is drawn for the TPointSeries (the "extra" grid line that you can see in the image that goes through the green arrow).

I attach an image of a section of my chart.
As you can see, the TPointSeries draws an extra unwanted vertical grid line and the corresponding x-axis text that looks messy. How do I stop it from drawing the vertical grid line as well as adding the axis text?